Homebrew Crayon Physics for the DS! Works great, although the code is a bit buggy (froze up my DS a few times). Not really a game yet, more like a physics construction kit. Still, it's a nice tech demo and proof that DS can handle a Crayon Physics Deluxe type game. Bring it on, developers!
EDIT: Video: http://youtube.com/watch?v=iIpDRbaVtD4
Homepage with download links: http://tobw.net/index.php?cat_id=3&p...Pocket+Physics